Professional Information — Necon 7/7/7

Indications and Usage

NECON 7/7/7^® Tablets are indicated for the prevention of pregnancy in women who elect to use this product as a method of contraception.

Oral contraceptives are highly effective. Table I lists the typical accidental pregnancy rates for users of combined oral contraceptives and other methods of contraception. The efficacy of these contraceptive methods, except sterilization, the IUD, and the NORPLANT^® System depends upon the reliability with which they are used. Correct and consistent use of methods can result in lower failure rates.

NECON 7/7/7^® has not been studied for and is not indicated for use in emergency contraception.

Dosage and Administration

To achieve maximum contraceptive effectiveness, NECON 7/7/7^® Tablets must be taken exactly as directed and at intervals not exceeding 24 hours. NECON 7/7/7^® Tablets are available in a blister card with a tablet dispenser which is preset for a Sunday Start. Day 1 Start is also available.

Sunday Start

When taking NECON 7/7/7^®, the first white "active" tablet should be taken on the first Sunday after menstruation begins. If the period begins on Sunday, the first white "active" tablet should be taken that day. Take one active tablet daily for 21 days followed by one green "reminder" tablet daily for 7 days. After 28 tablets have been taken, a new course is started the next day (Sunday). For the first cycle of a Sunday Start regimen, another method of contraception, such as a condom or spermicide, should be used until after the first 7 consecutive days of administration.

If the patient misses one (1) active tablet in Weeks 1, 2, or 3, the tablet should be taken as soon as she remembers. If the patient misses two (2) active tablets in Week 1 or Week 2, the patient should take two (2) tablets the day she remembers and two (2) tablets the next day; and then continue taking one (1) tablet a day until she finishes the pack. The patient should be instructed to use a back-up method of birth control, such as a condom or spermicide, if she has sex in the seven (7) days after missing pills. If the patient misses two (2) active tablets in the third week or misses three (3) or more active tablets in a row, the patient should continue taking one tablet every day until Sunday. On Sunday the patient should throw out the rest of the pack and start a new pack that same day. The patient should be instructed to use a back-up method of birth control if she has sex in the seven (7) days after missing pills.

Complete instructions to facilitate patient counseling on proper pill usage may be found in the Detailed Patient Labeling ("How to Take the Pill" section).

Day 1 Start

The dosage of NECON 7/7/7^® for the initial cycle of therapy is one active tablet administered daily from the 1st through the 21st day of the menstrual cycle, counting the first day of menstrual flow as "Day 1" followed by one green "reminder" tablet daily for 7 days. Tablets are taken without interruption for 28 days. After 28 tablets have been taken, a new course is started the next day.

If the patient misses one (1) active tablet in Weeks 1, 2, or 3, the tablet should be taken as soon as she remembers. If the patient misses two (2) active tablets in Week 1 or Week 2, the patient should take two (2) tablets the day she remembers and two (2) tablets the next day; and then continue taking one (1) tablet a day until she finishes the pack. The patient should be instructed to use a back-up method of birth control, such as a condom or spermicide, if she has sex in the seven (7) days after missing pills. If the patient misses two (2) active tablets in the third week or misses three (3) or more active tablets in a row, the patient should throw out the rest of the pack and start a new pack that same day. The patient should be instructed to use a back-up method of birth control if she has sex in the seven (7) days after missing pills.

Complete instructions to facilitate patient counseling on proper pill usage may be found in the Detailed Patient Labeling ("How to Take the Pill" section).

The use of NECON 7/7/7^® for contraception may be initiated 4 weeks postpartum in women who elect not to breastfeed. When the tablets are administered during the postpartum period, the increased risk of thromboembolic disease associated with the postpartum period must be considered. (See CONTRAINDICATIONS and WARNINGS concerning thromboembolic disease. See also PRECAUTIONS: Nursing Mothers.) The possibility of ovulation and conception prior to initiation of medication should be considered.

(See Discussion of Dose-Related Risk of Vascular Disease from Oral Contraceptives.)

Contraindications

Oral contraceptives should not be used in women who currently have the following conditions:

• Thrombophlebitis or thromboembolic disorders
• A past history of deep vein thrombophlebitis or thromboembolic disorders
• Cerebral vascular or coronary artery disease (current or history)
• Valvular heart disease with complications
• Severe hypertension
• Diabetes with vascular involvement
• Headaches with focal neurological symptoms
• Major surgery with prolonged immobilization
• Known or suspected carcinoma of the breast
• Carcinoma of the endometrium or other known or suspected estrogen-dependent neoplasia
• Undiagnosed abnormal genital bleeding
• Cholestatic jaundice of pregnancy or jaundice with prior pill use
• Acute or chronic hepatocellular disease with abnormal liver function
• Hepatic adenomas or carcinomas
• Known or suspected pregnancy
• Hypersensitivity to any component of this product

Adverse Reactions

An increased risk of the following serious adverse reactions has been associated with the use of oral contraceptives (See WARNINGS).

• Thrombophlebitis and venous thrombosis with or without embolism
• Arterial thromboembolism
• Pulmonary embolism
• Myocardial infarction
• Cerebral hemorrhage
• Cerebral thrombosis
• Hypertension
• Gallbladder disease
• Hepatic adenomas or benign liver tumors

There is evidence of an association between the following conditions and the use of oral contraceptives:

• Mesenteric thrombosis
• Retinal thrombosis

The following adverse reactions have been reported in patients receiving oral contraceptives and are believed to be drug-related:

• Nausea
• Vomiting
• Gastrointestinal symptoms (such as abdominal cramps and bloating)
• Breakthrough bleeding
• Spotting
• Change in menstrual flow
• Amenorrhea
• Temporary infertility after discontinuation of treatment
• Edema
• Melasma which may persist
• Breast changes: tenderness, enlargement, secretion
• Change in weight (increase or decrease)
• Change in cervical erosion and secretion
• Diminution in lactation when given immediately postpartum
• Cholestatic jaundice
• Migraine
• Allergic reaction, including rash, urticaria, angioedema
• Mental depression
• Reduced tolerance to carbohydrates
• Vaginal candidiasis
• Change in corneal curvature (steepening)
• Intolerance to contact lenses

The following adverse reactions have been reported in users of oral contraceptives and a causal association has been neither confirmed nor refuted:

• Pre-menstrual syndrome
• Cataracts
• Changes in appetite
• Cystitis-like syndrome
• Headache
• Nervousness
• Dizziness
• Hirsutism
• Loss of scalp hair
• Erythema multiforme
• Erythema nodosum
• Hemorrhagic eruption
• Vaginitis
• Porphyria
• Impaired renal function
• Hemolytic uremic syndrome
• Acne
• Changes in libido
• Colitis
• Budd-Chiari Syndrome

Drug Interactions

Changes in contraceptive effectiveness associated with co-administration of other products

Contraceptive effectiveness may be reduced when hormonal contraceptives are co-administered with antibiotics, anticonvulsants, and other drugs that increase the metabolism of contraceptive steroids. This could result in unintended pregnancy or breakthrough bleeding. Examples include rifampin, barbiturates, phenylbutazone, phenytoin, carbamazepine, felbamate, oxcarbazepine, topiramate, griseofulvin and bosentan. Several cases of contraceptive failure and breakthrough bleeding have been reported in the literature with concomitant administration of antibiotics such as ampicillin and tetracyclines. However, clinical pharmacology studies investigating drug interaction between combined oral contraceptives and these antibiotics have reported inconsistent results.

Several of the anti-HIV protease inhibitors have been studied with co-administration of oral combined hormonal contraceptives; significant changes (increase and decrease) in the plasma levels of the estrogen and progestin have been noted in some cases. The safety and efficacy of oral contraceptive products may be affected with co-administration of anti-HIV protease inhibitors. Healthcare professionals should refer to the label of the individual anti-HIV protease inhibitors for further drug-drug interaction information.

Herbal products containing St. John's Wort (hypericum perforatum) may induce hepatic enzymes (cytochrome P450) and p-glycoprotein transporter and may reduce the effectiveness of contraceptive steroids. This may also result in breakthrough bleeding.

Concurrent use of bosentan and norethisterone/ethinyl estradiol may result in decreased concentrations of these contraceptive hormones, thereby increasing the risk of unintended pregnancy and unscheduled bleeding.

Increase in plasma levels associated with co-administered drugs

Co-administration of atorvastatin and certain oral contraceptives containing ethinyl estradiol increase AUC values for ethinyl estradiol by approximately 20%. Ascorbic acid and acetaminophen may increase plasma ethinyl estradiol levels, possibly by inhibition of conjugation. CYP 3A4 inhibitors such as itraconazole or ketoconazole may increase plasma hormone levels.

Changes in plasma levels of co-administered drugs

Combined hormonal contraceptives containing some synthetic estrogens (e.g., ethinyl estradiol) may inhibit the metabolism of other compounds. Increased plasma concentrations of cyclosporin, prednisolone, and theophylline have been reported with concomitant administration of oral contraceptives. Decreased plasma concentrations of acetaminophen and increased clearance of temazepam, salicylic acid, morphine and clofibric acid, due to induction of conjugation, have been noted when these drugs were administered with oral contraceptives.

Combined hormonal contraceptives have been shown to significantly decrease plasma concentrations of lamotrigine when co-administered due to induction of lamotrigine glucuronidation. This may reduce seizure control; therefore, dosage adjustments of lamotrigine may be necessary.⁹⁵

Healthcare professionals are advised to also refer to prescribing information of co-administered drugs for recommendations regarding management of concomitant therapy.

Overdosage

Serious ill effects have not been reported following acute ingestion of large doses of oral contraceptives by young children. Overdosage may cause nausea, and withdrawal bleeding may occur in females.

Description

The following product is a combined oral contraceptive containing the progestational compound norethindrone and the estrogenic compound ethinyl estradiol.

NECON 7/7/7^® Tablets: Each white tablet contains 0.5 mg of norethindrone and 0.035 mg of ethinyl estradiol. Inactive ingredients include lactose, magnesium stearate and pregelatinized corn starch. Each light peach tablet contains 0.75 mg of norethindrone and 0.035 mg of ethinyl estradiol. Inactive ingredients include FD&C Yellow No. 6, lactose, magnesium stearate and pregelatinized corn starch. Each peach tablet contains 1 mg of norethindrone and 0.035 mg of ethinyl estradiol. Inactive ingredients include FD&C Yellow No. 6, lactose, magnesium stearate and pregelatinized corn starch. Each green tablet contains only inert ingredients, as follows: D&C Yellow No. 10 Aluminum Lake, FD&C Blue No. 2 Aluminum Lake, lactose, magnesium stearate, microcrystalline cellulose and pregelatinized corn starch.

The chemical name for norethindrone is 17-Hydroxy-19-nor-17α-pregn-4-en-20-yn-3-one, and for ethinyl estradiol is 19-Nor-17α-pregna-1,3,5(10)-trien-20-yne-3,17-diol. Their structural formulas are as follows:

Clinical Pharmacology

COMBINED ORAL CONTRACEPTIVES

Combined oral contraceptives act by suppression of gonadotropins. Although the primary mechanism of this action is inhibition of ovulation, other alterations include changes in the cervical mucus (which increase the difficulty of sperm entry into the uterus) and the endometrium (which reduce the likelihood of implantation).

How Supplied / Storage and Handling

NECON 7/7/7^® Tablets are available in a blister card (NDC 52544-936-28) with a tablet dispenser (unfilled). The blister card contains 28 tablets, as follows: 7 white, round, flat-faced, beveled edged tablets imprinted WATSON on one side and 937 on the other side (0.5 mg norethindrone and 0.035 mg ethinyl estradiol), 7 light peach, round, flat-faced, beveled edged tablets imprinted WATSON on one side and 938 on the other side (0.75 mg norethindrone and 0.035 mg ethinyl estradiol), 7 peach, round, flat-faced, beveled edged tablets imprinted WATSON on one side and 939 on the other side (1 mg norethindrone and 0.035 mg ethinyl estradiol) and 7 green, round, flat-faced, beveled edged tablets imprinted WATSON on one side and "P" on the other side containing inert ingredients.

STORAGE

Store at 25°C (77°F); excursions permitted to 15°–30°C (59°–86°F).

Keep out of reach of children.

Patient Counseling Information

See Patient Labeling printed below.